⬆️ Update actions/download-artifact action to v4 (#186)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/tests.yaml

@@ -53,7 +53,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: ⬇️ Download coverage data
-        uses: actions/download-artifact@v3.0.2
+        uses: actions/download-artifact@v4.1.1
       - name: 🏗 Set up Poetry
         run: pipx install poetry
       - name: 🏗 Set up Python ${{ env.DEFAULT_PYTHON }}